Then + Now: Your Favorite Nickelodeon Stars of the ’90s

If you grew up in the '90s, chances are you watched a ton of Nickelodeon original programming. But just like you, your favorite Nick stars grew up -- so let's see what they're up to these days.

Larisa Oleynik ('The Secret World of Alex Mack')

Nickelodeon/ABC

Then: Larisa Oleynik played Alex Mack, a teenager who gains powers when she comes into contact with radioactive waste. Her most memorable power was turning into a puddle of metallic liquid.

Now: Oleynik went on to star in the teen rom-com '10 Things I Hate About You' with Joseph Gordon-Levitt and the late Heath Ledger. She disappeared for a bit, but resurfaced recently with high profile acting gigs on the TV shows 'Hawaii Five-0' and 'Mad Men.'

Melissa Joan Hart ('Clarissa Explains It All')

Nickelodeon/Jason Merritt, Getty Images

Then: Melissa Joan Hart told it like it was every week as sassy, stylish teen Clarissa Darling. We could all relate to her annoyances with her little brother, Ferguson, and the crush she developed on her BFF, Sam.

Now: Hart went on to star as Sabrina in the 'Sabrina the Teenage Witch' TV series, and had roles in the teen films 'Can't Hardly Wait' and 'Drive Me Crazy.' More recently's she's starred with fellow '90s actor Joey Lawrence (of 'Blossom' fame) on the ABC Family series 'Melissa and Joey.'

Michael C. Maronna ('The Adventures of Pete and Pete')

Nickelodeon/YouTube

Then: Michael C. Maronna played eldest brother Big Pete in the quirky Nick series 'The Adventures of Pete and Pete,' about two awesome red-headed brothers. He also played one of the McAllister family members in the 'Home Alone' movies.

Now: His acting career hasn't exactly been steady, but he's had roles in '40 Days and 40 Nights' and 'Slackers.' Maronna has also worked as an electrician on films like 'Sex and the City' and 'Be Kind Rewind.'

Danny Tamberelli ('The Adventures of Pete and Pete')

Nickelodeon/YouTube

Then: Danny Tamberelli played younger bro Little Pete on 'The Adventures of Pete and Pete' -- you might remember his character had a fake arm tattoo named Petunia. He later starred on the Nick sketch show 'All That' and made appearances on the network's game show 'Figure It Out.'

Now: Today, Tamberelli focuses on his music -- as a member of the band Jounce, he's released three records. He's also a member of the Man Boobs Comedy sketch group. He did reunite with his 'Adventures of Pete and Pete' co-stars for a special panel at the San Francisco Sketchfest.

Christine Taylor ('Hey Dude')

Nickelodeon/Jason Merritt, Getty Images

Then: Christine Taylor played all-American blonde Melody Hanson on 'Hey Dude,' a show about a group of teens working on a dude ranch. The show only lasted for a few seasons, but had 62 episodes. Taylor also appeared on 'Saved by the Bell' and 'Blossom.'

Now: Taylor starred as Marcia Brady in two 'Brady Bunch' films in the '90s, as well as the high school witch movie 'The Craft.' She's also been in a few episodes of 'Arrested Development' and in the film 'Tropic Thunder,' the latter with her real-life husband Ben Stiller.

Kenan Thompson ('All That')

Nickelodeon/Ben Gabbe, Getty Images

Then: As one half of the duo Kenan and Kel, Kenan Thompson made us laugh every week on the sketch show 'All That' -- especially with his French lessons, which were hilariously wrong. He also starred with his partner Kel in 'Good Burger,' based on one of their recurring sketches.

Now: Sketch comedy never left Kenan Thompson's brain -- he now appears as a regular cast member on 'Saturday Night Live,' and has had roles in movies like 'Snakes on a Plane' and 'Fat Albert.'

Kel Mitchell ('All That')

Nickelodeon/Kevin Winter, Getty Images

Then: The other half of Kenan and Kel, Kel also starred on 'All That' and in 'Good Burger' with his acting buddy, Kenan Thompson.

Now: After 'All That,' Mitchell found roles in 'Mystery Men' and on TV shows like 'The Parkers.' In recent years he's done voice work for animated shows such as 'Motorcity' and 'Wild Grinders,' become a devout Christian and married rapper Asia Lee.

Amanda Bynes ('All That')

Nickelodeon/Twitter

Then: One of the biggest breakout stars of 'All That' was Amanda Bynes, whose 'Ask Ashley' sketches earned her a show of her very own -- 'The Amanda Show.'

Now: Bynes continued to act, starring in 'What a Girl Wants,' 'She's the Man,' 'Hairspray' and 'Easy A.' After that film, Bynes announced she was retiring from acting, then she quickly reversed her proclamation, and then she sort of retired again? And then she kinda went ... well, "off the rails," shall we say. Amanda's been arrested a few times, and her Twitter account is the stuff of legend.